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Online since: October 2022
Authors: Rathinam Kalidasan
Tool parting distance, rake angle and edge radius affects surface integrity.
A positive correlation was obtained between these factors and negative residual stress.
It consists of geometric modeling of tool and workpiece and assigning material properties as per Johnson-Cook material model.
Due to these factors higher compressive residual stresses are induced on machined work surface when the cutting speed is increased from 150 m/min to 250 m/min, for all chosen rake angles.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2011, 225, 1407-1417.
Online since: September 2011
Authors: Krzysztof Druet, Szymon Grymek, Jacek I. Lubinski, Henryk Olszewski
In the paper findings are discussed on the issue of dynamic characteristics of a tribometer as a factor influencing the result of the tribological experiment.
Among most important factors are the properties of sliding materials and lubricant, load/velocity input and contact geometry, but also dynamic characteristics of the machine (tester) which influenced the friction process.
Grudzinski et al. [5] emphasized the necessity of correct representation of friction forces when conducting dynamic modelling of a mechanical system, especially when subjected to alternating load and velocity.
As a classical example of a wide, multi – factor fundamental tribological research programme the VAMAS can be recalled [4] as an attempt to achieve repeatability and reproducibility in sliding friction experiments.
In most tests no vibration measurement was available, so it can only be speculated on the basis of measured friction coefficient scatter, that in a given test there could be a vibration factor involved.
Online since: August 2006
Authors: J. Hou, George Jeronimidis
The material properties of the unidirectional composites measured at Risø National Laboratory in Denmark are given in Table 1.
Table 1 Material properties of GRP used.
The composite was Load 100 mm Gauge 4 Gauge 2 Gauge 1 1325 mm 125 mm 100 mm 1325 mm Region prone to delaminate simulated as anisotropic elastic material with the properties given in Table 1.
However, this did not have any affect on the static proof loading of the suspension nor on its fatigue life.
We would also like to express our thanks to Risø National Laboratory for the material's mechanical properties.
Online since: September 2014
Authors: Rudeerat Suntako
Although ZnO as activator of sulfur vulcanization is an important factor for rubber processing.
Control of ZnO as activator related to processing and properties of rubber.
Advantage properties are light weight, cushioning performance, acoustic insulation and good aging.
Zakaria et al. [5] investigated the effect of foaming temperature on morphology and compressive properties of Ethylene propylene diene monomer (EPDM) foam.
Al. [12] reported similar results and explained that ZnO nanoparticle at 20 wt% content obtained similar cure characteristics and mechanical properties to conventional ZnO because the increase in specific surface area of ZnO.
Online since: February 2013
Authors: Qiang Shen, Lian Meng Zhang, Jun Yan Wu, Fei Chen
Introduction As an important member of transparent conducting oxides (TCOs), antimony-doped tin oxide (ATO) has been widely studied not only because of its unique combination of transparency in the visible range and high electric conductivity but also its chemical, mechanical and environmental stabilities [1-4].
The properties of as-synthesized ATO nanoparticles with different citric acid content are given in Table 1.
Properties of ATO nanoparticles with different citric acid content citric acid content in precursor (CA: metal) Sb Content in ATO Nanoparticles [at.%] Particle Size [nm] specific surface area [m2g-1] as determined via EDX as determined via XPS as determined via XRD as determined via TEM 1 3.62 4.43 11.4 5-10 38.4 1.5 6.43 7.02 20.1 10-15 30.1 2 9.73 11.06 26.8 20-25 25.5 3 9.20 14.76 34.9 25-30 20.6 Fig.2 Morphology, size, and Sb content of 10at.% ATO nanoparticles prepared as the citric acid content is CA: metal = 2.
Properties of ATO nanoparticles with different Sb content and same citric acid content Sb content in precursor solution [at.%] Sb Content in ATO Nanoparticles [at.%] Particle Size [nm] Molar ratio of Sb5+ and Sb3+ ( Sb5+/Sb3+) as determined via EDX as determined via XPS as determined via XRD as determined via TEM 1 1.2 0.7 15.6 10-15 1.363 5 5.78 7.02 20.1 15-20 2.35 10 9.73 11.06 26.8 20-25 1.958 15 16.76 17.3 23.4 15-20 1.688 20 21.5 24.5 25.7 20-25 1.293 30 27.82 25 20.4 20-25 1.022 Properties of ATO nanoparticles with different Sb content and citric acid content of CA: metal = 2 is illustrated as Table 2.
The change of particle size has been affected by two factors: (1) With the Sb content increasing, the content of Sb3+ with an ionic radius (0.76Å) larger than Sn4+ (0.69Å) increases, which indicates that the cell parameter of ATO also increases. (2) With the Sb content increasing, the condition around the Sn4+ in the solution changes, which affects the final size of ATO particle.
Online since: May 2014
Authors: Zi Qiang Li, Jin Gui Yu, Qiao Xin Zhang
Effects of Temperature on Crack Propagation of Nanocrystalline Nickel: A Molecular Dynamics Approach Ziqiang Li1, a, Jingui Yu2, b, Qiaoxin Zhang2, c 1School of Science, Hubei University of Technology, Wuhan 430068, China; 2School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China aliziqiangcos@126.com, byujingui@126.com, czhangqx@whut.edu.cn Keywords: Nanocrystalline nickel, Crack propagation, Dislocation, Molecular dynamics.
Introduction Diversity in mechanical properties of materials derived from different grain size.
Table 1 Temperature and loading velocity factors for three models Models temperature(K) loading velocity (Å/fs) І 10 0.1 II 300 0.1 III 500 0.1 Results and discussions (a) 30 ps (b) 32 ps (c) 36 ps (d) 38 ps Fig. 1 Nickel single crystal dislocation formation and movement at temperature of 10 K.
This is mainly because the dislocation is affected by temperature, and the temperature prompted intense thermal motion of atoms.
Online since: March 2015
Authors: Jian Bo Xiong, Li Zhi Guo, Xin Gao
Introduction Seaport is a major and logistics infrastructure fortransport export trade.as China's sustained and rapid economic development, harbor projectsis presenting to large scale, complicated construction technology, deepwater and offshore features. steel structure with its excellent physical, mechanical, is favored in the environmentof large waves, complex geological conditions, urgent need of specialized portsand deepwater berths, which other materials cannot match these advantages.
But steel in the marine environment, such as not to take protective measures ,is vulnerable to be attacked by electrochemical corrosion and other damage,which makes steel thickness decrease, physical performance degradation and local stress concentration and directly affect use function andlife of engineering structures, even accidents[1].
Actualamount of oxygen supply is closely related to environmental factors such as seawater velocity, salinity,temperature and sea creatures.The corrosion rate ofsteel structure varieswith the region, especially the splash zone with maximum corrosion rate, because of the range of alternating wet and frequent temperature fluctuations, coupled with seawater bubbles and floating debris impact damage to the surface and a protective layer, whichcreaterich supply of oxygen in the form of film near the steel surface, and can easily cause significant corrosion.In order to resist the corrosion, it’s feasible to startfrom the mechanism of electrochemical corrosion.Firstly it’s effective to forma surface barrier to reduce the oxygen concentration in the surface of steel surfaces, such as corrosion-resistant steel, protective coatings or surface coating,on the other hand measures can be taken to change steel corrosion characteristics of half-cell reaction and keep the steel piles from the electrochemical
Impressed current cathodic protection systems typically includes an auxiliary anode, reference electrode, a DC power supply, control systems and cable,suitable for steel structure with different orhigher change ofresistivity .it’s of more economical when large projects, relatively concentrated component distribution.Meanwhile,itspost-maintenance requirements are relatively high. 2.5Coating Layer Technology[5] Coating layer technology is a surface treatmentmethod combined with corrosion inhibitor and oxygen sealingtechnology withlow requirements,which can be used in wet or underwater.It can provide good protective layer thickness, mechanical properties and anti-corrosion performance according to the demand,and can be used as an effective protective measures for new steelstructure insplash zone , as well as an important choice for repairmen of old steelstructure.
Online since: October 2015
Authors: Ju Dong Liu, Guo Hong Yan, You Sheng Li, Xiao Fan Yang, Li Kun Huang, Dong Min Yu
Experimental study on surface quality in milling carbon fiber reinforced plastics Judong Liu1,a, Yousheng Li2, b, Guohong Yan2,c and Likun Huang2,d, Xiaofan Yang1,e, Dongmin Yu1,f 1School of Mechanical and Energy Engineering, Jimei University, Xiamen 361021, China. 2Xiamen Golden Egret Special Alloy Co., Ltd, Xiamen 361021, China.
Introduction CFRP have been widely used in the areas of aerospace, transportation and health care, owing to it having excellent properties such as high strength, light weight, good wear-resistance, strong fatigue resistance, excellent corrosion resistance, etc [1-2].
But CFRP is two-phase or multiphase material which consists of soft viscous matrix and hardness fiber with mechanical anisotropy, so the disadvantages such as delimitation, dilacerations, burrs, wire drawing and bursting crack are frequently found in cutting process, and cutting tool also wears severely [3-4].Therefore the studies on CFRP cutting have been paid widely attention both at home and abroad.
Therefore, the sharpness of tool is one of the key influence factors in milling CFRP.
The sharpness of tool is affected by the tool geometry angles, installation, actual cutting process and tool wear, etc.
Online since: December 2011
Authors: B. Kusz, P. Jasinski, B. Bochentyn, K. Gdula-Kasica, T. Lendze, W. Lewandowska-Iwaniak, A. Mielewczyk-Gryn, S. Molin, M. Gazda
Packing factor of perovskites is high, it is usually around 0.75 (e.g. 0.76 in LaMnO3).
Properties of iron-doped calcium titanate are similar to these of strontium titanate.
Properties of perovskite materials allow applying them as components of SOFCs.
Maiti, Role of covalency in the ground-state properties of perovskite ruthenates.
Dunyushkina, Electrophysical properties of titanates of alkaline-earth metals, Russ.
Online since: December 2013
Authors: En Rong Mao, Zhen Li, Bin Xie, Zhong Xiang Zhu
Stabilization of the operating speed is a vital factor that affects a combine harvester's productivity.
It means that the positional precision of the assembly parts affects the simulation results a lot.
The quality of mesh is a pivotal factor throughout the entire simulation process.
Liu: Mechanical Design, 1st ed.
Wu: Mechanical Designer Hankbook, 1st ed.
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